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TitleDirect determination of arsenic in fresh and saline waters by electrothermal vaporization inductively coupled plasma mass spectrometry
 
AuthorGrégoire, D C; de Lourdes Ballinas, M
SourceSpectrochimica Acta, Part B: Atomic Spectroscopy 52B, 1997 p. 75-82, https://doi.org/10.1016/s0584-8547(96)01561-3
Year1997
Alt SeriesGeological Survey of Canada, Contribution Series 1996133
PublisherElsevier BV
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
Subjectsgeochemistry; arsenic geochemistry; chemical analysis; analytical methods; water geochemistry
Illustrationsanalyses
AbstractA method is described for the direct determination of arsenic in fresh and saline waters by electrothermal vaporization inductively coupled plasma mass spectrometry. Arsenic could be determined directly in waters containing up to 10 000 µg ml-1 NaCl without interference from the formation of 75ArCl+. For non-saline waters, arsenic was determined directly with the addition to both aqueous calibration standards and samples of 0.1 µg each of Pd and Mg to act as physical carriers. For the analysis of highly saline waters, the use of Pd and Mg chemical modifier served to thermally stabilize arsenic up to a temperature of 1000°C, while the separate addition of 8 mg of ammonium nitrate was used to remove chloride from the sample. This eliminated serious spectral interference on 75As+ from 75ArCl+. Although the ArCl+ spectral interference was completely eliminated, residual Na co-volatilized with As caused signal suppression, requiring the use of the method of standard additions for calibration. An absolute limit of detection limit for As of 0.069 pg was obtained corresponding to 6.9 pg ml-1 in a 10 µl sample.
GEOSCAN ID207652

 
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